采用EBSD分析技术研究了Mg-7.0Al-0.4Zn镁合金超塑性变形机制.结果表明,超塑拉伸变形主要是通过晶界滑动和晶内塑性滑移协调完成的.变形初期,随着变形量的增大,{0002}//ED的织构明显增强,晶内滑移起主要协调变形作用.变形中后期孪生开动,接近断裂时,晶内滑移基本消失,孪生成为主要的协调变形机制,但孪生的贡献较小.
The superplastic deformation mechanism of Mg-7.0Al-0.4Zn alloy was studied by EBSD technology.Results indicate that with increasing of strain amount,the texture of {0002}//ED is strengthened obviously,and intragranular sliding plays a main role during the accommodated deformation.Twins have started at the medium and the final deformation stages; when approaching to failure,intragranular sliding vanishes,and twins replace it to play a main role.But the contribution of twins to deformation is relatively small.
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